[ICOM] IC781 Tx problem

[mecker at peoplepc.com]

I was on the money before
I read this email. It is a voltage
(controlled by alc) but
nonte theless voltage problem.
----- Original Message ----- 
From: "Jaime Gomez" <jgomez2005 at gmail.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Friday, December 05, 2008 9:12 PM
Subject: [ICOM] IC781 Tx problem


>I was working in my 781 tx problem today, I have traced the problem to the
> ALC, the ALC voltage is taking some time (about 3 seconds) to develop.
> Checking the ALC circuit I found some of the problems mentioned by K1VF 
> like
> -9.0 volts was -7.45, fixed it in the PI board, R108 was 4.7 k ohms 
> instead
> of 100 ohms, R112 was 10k ohms instead of 4.7 k and D15 was missing. I 
> have
> replaced the missing or miss placed components and I suspect that Q135 is
> bad, I will replace it tomorrow, as well as the capacitors C47 & C48 just 
> in
> case and will test in the afternoon, hope this will solve the problem. 
> Will
> keep you informed..
>
> 73
>
> -- 
> Jim, HK1N
> Barranquilla, Colombia
> Tel: +57 312 6642680
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